Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Income Statement [Abstract]
Net sales	$ 445,945	$ 495,010	$ 1,278,205	$ 1,343,595
Cost of sales	141,525	152,007	402,712	408,156
Gross margin	304,420	343,003	875,493	935,439
Research and development expense	95,336	91,393	278,542	265,619
Selling, general, and administrative expense	78,907	74,243	235,376	215,824
Amortization of acquisition-related intangible assets	1,846	213	2,974	640
Compensation expense — deferred compensation plan	3,462	3,274	6,724	6,697
Gain on deferred compensation plan securities	(3,462)	(3,274)	(6,724)	(6,697)
Interest income and other	(2,214)	(2,775)	(6,651)	(5,997)
(Gain)/loss reclassified from other comprehensive income	(33)	108	(129)	(63)
Interest expense	2,511	2,333	8,365	5,386
Income before income taxes	128,067	177,488	357,016	454,030
Income tax expense	8,635	19,999	15,885	18,028
Net income	119,432	157,489	341,131	436,002
Unrealized holding gain/(loss) on investments:
Unrealized holding gain/(loss) on investments arising during period, net of tax of $30, $43, ($12) and $108	2,419	3,620	(6,613)	6,723
Less: Reclassification adjustments for gain on investments included in net income, net of tax of $11, $1, $21 and $6	(22)	(41)	(108)	(64)
Total other comprehensive income, unrealized (loss)/gain on investments	2,397	3,579	(6,721)	6,659
Unrealized (loss)/gain on derivatives:
Unrealized (loss)/gain on derivatives arising during period, net of tax of ($6) and $36	0	(10)	0	67
Less: Reclassification adjustments for loss on derivatives included in net income, net of tax of $53 and $2	0	97	0	5
Total other comprehensive income, unrealized gain on derivatives	0	87	0	72
Other comprehensive income/(loss)	2,397	3,666	(6,721)	6,731
Comprehensive income	$ 121,829	$ 161,155	$ 334,410	$ 442,733
Net income per share (in dollars per share):
Basic (in dollars per share)	$ 0.37	$ 0.49	$ 1.07	$ 1.36
Diluted (in dollars per share)	$ 0.37	$ 0.49	$ 1.05	$ 1.34
Shares used in computing per share amounts (in shares):
Basic (in shares)	320,445	319,870	320,266	321,200
Diluted (in shares)	323,505	323,560	323,355	325,275
Dividends per common share	$ 0.15	$ 0.10	$ 0.35	$ 0.26